How to get a plane to emit an object in a fluid simulation?
you might want to use a particle simulation or something like that, because fluid simulations look good as mesh but as particles that have objects they usually don't look very good.
in order to get the collisions to work you might want to get the molecular script addon and learn how to use it.
https://www.youtube.com/watch?v=iLDCr9734r8
this is a video that explains how to make a bunch of balls but if in the particle settings you set gravity to negative and the corridor to a collider you can get it to look like balloons